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1.
Treo, a smartphone by Palm(One), formerly Handspring. It is a PDA and cell phone in one, with a nicely sized qwerty keyboard. The current model is the Treo 650.
You have a treo as your cell phone? Nice.
by mavie June 09, 2005
 
2.
A series of smartphones by Palm running the Palm OS or Windows Mobile platforms.

Models:
Treo 90
Treo 180
Treo 180g
Treo 270
Treo 300
Treo 600
Treo 650
Treo 700w
Treo 700p
Treo 700wx
Treo 680
Treo 750v
Treo 750
Treo 755p
Treo 500
Bill Gates says he uses a Treo 700wx
by Chimuel January 20, 2008
 
3.
An electronic device that attempts to function as a phone and a PDA prone to re-boots, lock-ups and general poor operation so it makes a better paper weight.
Sorry I missed your call, I have a treo. It is currently holding down my inbox.
by Goat captain May 05, 2007
 
4.
Something that is more gay than an iPhone, a Treo.
Mike: The newest iPhone is so gay!
Matt: Just wait a few years, then it will be Treo.
by R1cochet August 11, 2008